Rosemary Ainslie Circuit Demonstration June 29, 2013 Video Segments

[TinselKoala]

Part 2 removes the bias battery and shows how the Function Generator fits into the circuit in the same place and performs the same role, only with a polarity reversal with every cycle of the FG's output.
http://www.youtube.com/watch?v=7i0DziLllc0

[TinselKoala]

Part 3 puts in the IRFPG50 mosfet on some long wires and ups the supply to 24 volts from batteries. The rate of pulsation from the FG is increased up to around 1600 or 1700 Hz. The oscillations show up at the end.

http://www.youtube.com/watch?v=3vm2ZTDUyyA

[TinselKoala]

Part 4 removes the non-linear light bulb load and puts in a 10 ohm wirewound resistor stack for the load. A 1-ohm Current Viewing Resistor (aka "shunt" or Current Sense Resistor) is also incorporated in the location specified. I've also redrawn the schematic to show its exact correspondence with the Paper 1 schematic.... except I show the correct (wrong) location of the FG Black lead on my version, which the Paper 1 version does not.

http://www.youtube.com/watch?v=1jENARrROGs

[TinselKoala]

Parts 4a&b are combined together and demonstrate the negative drive from the Function Generator, including a frequency determination of the oscillation frequency.

Then I remove the FG and use a 12 volt battery, a resistor and a light bulb to provide a constant negative bias current in place of the FG. The oscillations are shown and their frequency is measured to be the same as when the FG was used.

Further, the little light bulb is shown to be lit dimly, proving that there is current passing, overall, through the FG, which is acting both as a series power supply (when its Red lead goes negative) and a 50 R impedance to the flow of current through the batt pos rail-load-drain-source-FG-batt neg rail loop.

http://www.youtube.com/watch?v=kV2ePEbJ76I

[TinselKoala]

Part 4c is the RF power demonstration, and uses the same schematic as Part 4.

http://www.youtube.com/watch?v=H14qF_CLHp8

Part 4d is the alt.snakeoil Video Report showing audio modulation of the RF: a complete AM radio broadcast station!

http://www.youtube.com/watch?v=I854Zd65B-k

And then of course there is the "punchline" of the Q2 Current Measuring During Oscillations joke: What is the Donovan Martin-Rosemary Ainslie team actually measuring when they measure oscillations on the CVR shunt resistor by their methodology?

http://www.youtube.com/watch?v=C72jwywsz3w